Seawater carbonate chemistry and shift towards larger diatoms in a natural phytoplankton assemblage under combined high-CO2 and warming conditions ...

• Main Authors: Sett, Scarlett, Schulz, Kai, Bach, Lennart Thomas, Riebesell, Ulf
• Format: Dataset
• Language: English
• Published: PANGAEA 2023
• Subjects: Baltic Sea; Biomass/Abundance/Elemental composition; Coast and continental shelf; Community composition and diversity; Entire community; Laboratory experiment; Mesocosm or benthocosm; Pelagos; Temperate; Temperature; Type of study; Experiment duration; Treatment; Replicate; pH; Partial pressure of carbon dioxide water at sea surface temperature wet air; Alkalinity, total; Carbon, inorganic, dissolved; Carbon, organic, particulate; Carbon, organic, dissolved; Carbon, organic, particulate/Nitrogen, organic, particulate ratio; Carbon, organic, particulate/Phosphorus, organic, particulate ratio; Nitrogen, organic, particulate/Phosphorus, organic, particulate ratio; Chlorophyll a; Cell density; Percentage; Salinity; Temperature, water; Carbonate system computation flag; Carbon dioxide; Fugacity of carbon dioxide water at sea surface temperature wet air; Bicarbonate ion; Carbonate ion; Aragonite saturation state; Calcite saturation state; Calculated using CO2SYS; Potentiometric titration; Coulometric titration; Calculated using seacarb after Nisumaa et al. 2010; Ocean Acidification International Coordination Centre OA-ICC; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.959214; https://doi.pangaea.de/10.1594/PANGAEA.959214

An indoor mesocosm experiment was carried out to investigate the combined effects of ocean acidification and warming on the species composition and biogeochemical element cycling during a winter/spring bloom with a natural phytoplankton assemblage from the Kiel fjord, Germany. The experimental setup consisted of a “Control” (ambient temperature of ~4.8 °C and ~535 ± 25 μatm pCO2), a “High-CO2” treatment (ambient temperature and initially 1020 ± 45 μatm pCO2) and a “Greenhouse” treatment (~8.5 °C and initially 990 ± 60 μatm pCO2). Nutrient replete conditions prevailed at the beginning of the experiment and light was provided at in situ levels upon reaching pCO2 target levels. A diatom-dominated bloom developed in all treatments with Skeletonema costatum as the dominant species but with an increased abundance and biomass contribution of larger diatom species in the Greenhouse treatment. Conditions in the Greenhouse treatment accelerated bloom development with faster utilization of inorganic nutrients and an ... : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2022) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI). The date of carbonate chemistry calculation by seacarb is 2023-05-23. ...